get final image width and height from the selection area

index.js

@@ -16,6 +16,13 @@ const dialog_box = require('./dialog_box')
 const html_manip = require('./html_manip')
 const export_png = require('./export_png')
 const viewer = require('./viewer')
+const selection = require('./selection')
+
+
+const eventHandler = (event, descriptor) => {
+  console.log("event got triggered!")
+  console.log(event, descriptor)}
+require("photoshop").action.addNotificationListener(['all'], eventHandler);
 
 
 async function getUniqueDocumentId () {

psapi.js

@@ -829,7 +829,7 @@ async function createClippingMaskExe () {
 
 async function checkIfSelectionAreaIsActive()
 {
-  let isSelectionAreaValid = getSelectionInfoExe()
+  let isSelectionAreaValid = await getSelectionInfoExe()
 return isSelectionAreaValid
 }
 async function saveUniqueDocumentIdExe (new_id) {

selection.js

@@ -0,0 +1,43 @@
+
+function finalWidthHeight(selectionWidth,selectionHeight,minWidth,minHeight){
+    // const minWidth = 512
+    // const minHeight = 512
+    
+    // const selectionWidth = 256
+    // const selectionHeight = 1000
+    
+    let finalWidth = 0
+    let finalHeight = 0
+    
+    if(selectionWidth <= selectionHeight){
+        //do operation on the smaller dimension
+        const scaleRatio =  selectionWidth / minWidth  
+        
+        finalWidth = minWidth
+        finalHeight = selectionHeight / scaleRatio
+    }else{
+        const scaleRatio =  selectionHeight / minHeight  
+
+    finalHeight = minHeight
+    finalWidth = selectionWidth / scaleRatio
+}
+    return [finalWidth,finalHeight]
+}
+
+async function selectionToFinalWidthHeight(){
+    const {getSelectionInfoExe} = require('./psapi')
+    try{
+
+        const selectionInfo = await getSelectionInfoExe()
+        const [finalWidth,finalHeight] = finalWidthHeight(selectionInfo.width,selectionInfo.height,512,512)
+
+        return [parseInt(finalWidth),parseInt(finalHeight)]
+    }catch(e){
+        console.warn("you need a rectangular selection",e)
+    }
+}
+
+module.exports = {
+finalWidthHeight,
+selectionToFinalWidthHeight
+}